Poaceae
Agrostis

Agrostis ambatoensis Asteg.

First published in Bol. Soc. Argent. Bot. 20: 271 (1982)
This species is accepted
The native range of this species is NW. Argentina. It is a perennial and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Perennial. Culms 3-5 cm long; 1 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.2-0.3 mm long; erose. Leaf-blades flat, or conduplicate; 1-2 cm long; 0.5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 7-9 fertile spikelets. Panicle open; oblong; 1-2 cm long; bearing few spikelets. Primary panicle branches 3-6 in number. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.4-1.5 mm long; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.8-2.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.8-2.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2-2.2 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.8-2.1 mm long; 1.5-1.7 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic; 1.2-1.3 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.6-1 mm long overall; not or scarcely exserted from spikelet. Palea 0.2 mm long; hyaline; 0 -veined.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.2 mm long; membranous. Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; 1 mm long. Hilum linear.
Distribution
South America: southern South America.
Reference
Aveneae. Asteg 1997.
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0